vi_, you probably have seen this, but, just in case you didn't:
http://talk.maemo.org/showthread.php?t=81408

I think it's definitely worth interest and further investigation. Pi itself isn't big think to carry, and using freemangordon's proposed method, You can also export ED to any other linuxbox (even if started via liveCD/whatever) with USB port, *without* using Pi as intermedium.

/Estel

// Edit
I hope that during upcoming years, *good* DVI (or HDMI) micro-projectors (laser ones) will become much cheaper - they're irrationally expensive now - so, carrying Pi and little projector as addition, we'll be free from *any* monitor requirement.